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334 lines
9.8 KiB
334 lines
9.8 KiB
/*
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* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.script;
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import java.util.*;
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import java.io.*;
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/**
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* Simple implementation of ScriptContext.
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*
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* @author Mike Grogan
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* @since 1.6
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*/
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public class SimpleScriptContext implements ScriptContext {
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/**
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* This is the writer to be used to output from scripts.
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* By default, a <code>PrintWriter</code> based on <code>System.out</code>
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* is used. Accessor methods getWriter, setWriter are used to manage
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* this field.
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* @see java.lang.System#out
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* @see java.io.PrintWriter
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*/
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protected Writer writer;
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/**
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* This is the writer to be used to output errors from scripts.
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* By default, a <code>PrintWriter</code> based on <code>System.err</code> is
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* used. Accessor methods getErrorWriter, setErrorWriter are used to manage
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* this field.
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* @see java.lang.System#err
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* @see java.io.PrintWriter
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*/
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protected Writer errorWriter;
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/**
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* This is the reader to be used for input from scripts.
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* By default, a <code>InputStreamReader</code> based on <code>System.in</code>
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* is used and default charset is used by this reader. Accessor methods
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* getReader, setReader are used to manage this field.
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* @see java.lang.System#in
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* @see java.io.InputStreamReader
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*/
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protected Reader reader;
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/**
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* This is the engine scope bindings.
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* By default, a <code>SimpleBindings</code> is used. Accessor
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* methods setBindings, getBindings are used to manage this field.
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* @see SimpleBindings
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*/
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protected Bindings engineScope;
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/**
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* This is the global scope bindings.
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* By default, a null value (which means no global scope) is used. Accessor
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* methods setBindings, getBindings are used to manage this field.
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*/
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protected Bindings globalScope;
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/**
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* Create a {@code SimpleScriptContext}.
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*/
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public SimpleScriptContext() {
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engineScope = new SimpleBindings();
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globalScope = null;
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reader = new InputStreamReader(System.in);
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writer = new PrintWriter(System.out , true);
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errorWriter = new PrintWriter(System.err, true);
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}
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/**
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* Sets a <code>Bindings</code> of attributes for the given scope. If the value
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* of scope is <code>ENGINE_SCOPE</code> the given <code>Bindings</code> replaces the
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* <code>engineScope</code> field. If the value
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* of scope is <code>GLOBAL_SCOPE</code> the given <code>Bindings</code> replaces the
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* <code>globalScope</code> field.
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*
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* @param bindings The <code>Bindings</code> of attributes to set.
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* @param scope The value of the scope in which the attributes are set.
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*
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* @throws IllegalArgumentException if scope is invalid.
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* @throws NullPointerException if the value of scope is <code>ENGINE_SCOPE</code> and
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* the specified <code>Bindings</code> is null.
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*/
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public void setBindings(Bindings bindings, int scope) {
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switch (scope) {
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case ENGINE_SCOPE:
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if (bindings == null) {
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throw new NullPointerException("Engine scope cannot be null.");
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}
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engineScope = bindings;
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break;
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case GLOBAL_SCOPE:
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globalScope = bindings;
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break;
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default:
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throw new IllegalArgumentException("Invalid scope value.");
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}
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}
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/**
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* Retrieves the value of the attribute with the given name in
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* the scope occurring earliest in the search order. The order
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* is determined by the numeric value of the scope parameter (lowest
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* scope values first.)
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*
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* @param name The name of the the attribute to retrieve.
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* @return The value of the attribute in the lowest scope for
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* which an attribute with the given name is defined. Returns
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* null if no attribute with the name exists in any scope.
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* @throws NullPointerException if the name is null.
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* @throws IllegalArgumentException if the name is empty.
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*/
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public Object getAttribute(String name) {
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checkName(name);
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if (engineScope.containsKey(name)) {
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return getAttribute(name, ENGINE_SCOPE);
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} else if (globalScope != null && globalScope.containsKey(name)) {
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return getAttribute(name, GLOBAL_SCOPE);
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}
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return null;
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}
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/**
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* Gets the value of an attribute in a given scope.
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*
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* @param name The name of the attribute to retrieve.
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* @param scope The scope in which to retrieve the attribute.
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* @return The value of the attribute. Returns <code>null</code> is the name
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* does not exist in the given scope.
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*
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* @throws IllegalArgumentException
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* if the name is empty or if the value of scope is invalid.
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* @throws NullPointerException if the name is null.
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*/
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public Object getAttribute(String name, int scope) {
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checkName(name);
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switch (scope) {
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case ENGINE_SCOPE:
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return engineScope.get(name);
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case GLOBAL_SCOPE:
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if (globalScope != null) {
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return globalScope.get(name);
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}
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return null;
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default:
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throw new IllegalArgumentException("Illegal scope value.");
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}
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}
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/**
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* Remove an attribute in a given scope.
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*
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* @param name The name of the attribute to remove
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* @param scope The scope in which to remove the attribute
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*
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* @return The removed value.
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* @throws IllegalArgumentException
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* if the name is empty or if the scope is invalid.
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* @throws NullPointerException if the name is null.
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*/
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public Object removeAttribute(String name, int scope) {
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checkName(name);
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switch (scope) {
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case ENGINE_SCOPE:
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if (getBindings(ENGINE_SCOPE) != null) {
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return getBindings(ENGINE_SCOPE).remove(name);
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}
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return null;
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case GLOBAL_SCOPE:
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if (getBindings(GLOBAL_SCOPE) != null) {
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return getBindings(GLOBAL_SCOPE).remove(name);
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}
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return null;
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default:
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throw new IllegalArgumentException("Illegal scope value.");
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}
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}
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/**
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* Sets the value of an attribute in a given scope.
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*
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* @param name The name of the attribute to set
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* @param value The value of the attribute
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* @param scope The scope in which to set the attribute
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*
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* @throws IllegalArgumentException
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* if the name is empty or if the scope is invalid.
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* @throws NullPointerException if the name is null.
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*/
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public void setAttribute(String name, Object value, int scope) {
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checkName(name);
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switch (scope) {
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case ENGINE_SCOPE:
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engineScope.put(name, value);
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return;
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case GLOBAL_SCOPE:
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if (globalScope != null) {
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globalScope.put(name, value);
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}
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return;
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default:
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throw new IllegalArgumentException("Illegal scope value.");
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}
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}
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/** {@inheritDoc} */
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public Writer getWriter() {
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return writer;
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}
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/** {@inheritDoc} */
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public Reader getReader() {
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return reader;
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}
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/** {@inheritDoc} */
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public void setReader(Reader reader) {
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this.reader = reader;
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}
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/** {@inheritDoc} */
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public void setWriter(Writer writer) {
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this.writer = writer;
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}
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/** {@inheritDoc} */
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public Writer getErrorWriter() {
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return errorWriter;
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}
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/** {@inheritDoc} */
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public void setErrorWriter(Writer writer) {
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this.errorWriter = writer;
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}
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/**
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* Get the lowest scope in which an attribute is defined.
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* @param name Name of the attribute
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* .
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* @return The lowest scope. Returns -1 if no attribute with the given
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* name is defined in any scope.
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* @throws NullPointerException if name is null.
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* @throws IllegalArgumentException if name is empty.
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*/
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public int getAttributesScope(String name) {
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checkName(name);
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if (engineScope.containsKey(name)) {
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return ENGINE_SCOPE;
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} else if (globalScope != null && globalScope.containsKey(name)) {
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return GLOBAL_SCOPE;
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} else {
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return -1;
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}
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}
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/**
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* Returns the value of the <code>engineScope</code> field if specified scope is
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* <code>ENGINE_SCOPE</code>. Returns the value of the <code>globalScope</code> field if the specified scope is
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* <code>GLOBAL_SCOPE</code>.
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*
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* @param scope The specified scope
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* @return The value of either the <code>engineScope</code> or <code>globalScope</code> field.
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* @throws IllegalArgumentException if the value of scope is invalid.
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*/
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public Bindings getBindings(int scope) {
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if (scope == ENGINE_SCOPE) {
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return engineScope;
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} else if (scope == GLOBAL_SCOPE) {
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return globalScope;
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} else {
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throw new IllegalArgumentException("Illegal scope value.");
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}
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}
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/** {@inheritDoc} */
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public List<Integer> getScopes() {
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return scopes;
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}
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private void checkName(String name) {
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Objects.requireNonNull(name);
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if (name.isEmpty()) {
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throw new IllegalArgumentException("name cannot be empty");
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}
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}
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private static List<Integer> scopes;
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static {
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scopes = new ArrayList<Integer>(2);
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scopes.add(ENGINE_SCOPE);
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scopes.add(GLOBAL_SCOPE);
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scopes = Collections.unmodifiableList(scopes);
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}
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}
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