001: /*
002: * Copyright (c) 2003 The Visigoth Software Society. All rights
003: * reserved.
004: *
005: * Redistribution and use in source and binary forms, with or without
006: * modification, are permitted provided that the following conditions
007: * are met:
008: *
009: * 1. Redistributions of source code must retain the above copyright
010: * notice, this list of conditions and the following disclaimer.
011: *
012: * 2. Redistributions in binary form must reproduce the above copyright
013: * notice, this list of conditions and the following disclaimer in
014: * the documentation and/or other materials provided with the
015: * distribution.
016: *
017: * 3. The end-user documentation included with the redistribution, if
018: * any, must include the following acknowledgement:
019: * "This product includes software developed by the
020: * Visigoth Software Society (http://www.visigoths.org/)."
021: * Alternately, this acknowledgement may appear in the software itself,
022: * if and wherever such third-party acknowledgements normally appear.
023: *
024: * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
025: * project contributors may be used to endorse or promote products derived
026: * from this software without prior written permission. For written
027: * permission, please contact visigoths@visigoths.org.
028: *
029: * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030: * nor may "FreeMarker" or "Visigoth" appear in their names
031: * without prior written permission of the Visigoth Software Society.
032: *
033: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036: * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044: * SUCH DAMAGE.
045: * ====================================================================
046: *
047: * This software consists of voluntary contributions made by many
048: * individuals on behalf of the Visigoth Software Society. For more
049: * information on the Visigoth Software Society, please see
050: * http://www.visigoths.org/
051: */
052:
053: package freemarker.core;
054:
055: import freemarker.template.*;
056: import java.util.*;
057:
058: final class HashLiteral extends Expression {
059:
060: private final ArrayList keys, values;
061: private final int size;
062:
063: HashLiteral(ArrayList keys, ArrayList values) {
064: this .keys = keys;
065: this .values = values;
066: this .size = keys.size();
067: keys.trimToSize();
068: values.trimToSize();
069: }
070:
071: TemplateModel _getAsTemplateModel(Environment env)
072: throws TemplateException {
073: return new SequenceHash(env);
074: }
075:
076: public String getCanonicalForm() {
077: StringBuffer buf = new StringBuffer("{");
078: for (int i = 0; i < size; i++) {
079: Expression key = (Expression) keys.get(i);
080: Expression value = (Expression) values.get(i);
081: buf.append(key.getCanonicalForm());
082: buf.append(" : ");
083: buf.append(value.getCanonicalForm());
084: if (i != size - 1) {
085: buf.append(",");
086: }
087: }
088: buf.append("}");
089: return buf.toString();
090: }
091:
092: boolean isLiteral() {
093: if (constantValue != null) {
094: return true;
095: }
096: for (int i = 0; i < size; i++) {
097: Expression key = (Expression) keys.get(i);
098: Expression value = (Expression) values.get(i);
099: if (!key.isLiteral() || !value.isLiteral()) {
100: return false;
101: }
102: }
103: return true;
104: }
105:
106: Expression _deepClone(String name, Expression subst) {
107: ArrayList clonedKeys = (ArrayList) keys.clone();
108: for (ListIterator iter = clonedKeys.listIterator(); iter
109: .hasNext();) {
110: iter.set(((Expression) iter.next()).deepClone(name, subst));
111: }
112: ArrayList clonedValues = (ArrayList) values.clone();
113: for (ListIterator iter = clonedValues.listIterator(); iter
114: .hasNext();) {
115: iter.set(((Expression) iter.next()).deepClone(name, subst));
116: }
117: return new HashLiteral(clonedKeys, clonedValues);
118: }
119:
120: private class SequenceHash implements TemplateHashModelEx {
121:
122: private HashMap keyMap; // maps keys to integer offset
123: private TemplateCollectionModel keyCollection, valueCollection; // ordered lists of keys and values
124:
125: SequenceHash(Environment env) throws TemplateException {
126: keyMap = new HashMap();
127: ArrayList keyList = new ArrayList(size);
128: ArrayList valueList = new ArrayList(size);
129: for (int i = 0; i < size; i++) {
130: Expression keyExp = (Expression) keys.get(i);
131: Expression valExp = (Expression) values.get(i);
132: String key = keyExp.getStringValue(env);
133: TemplateModel value = valExp.getAsTemplateModel(env);
134: assertNonNull(value, valExp, env);
135: keyMap.put(key, value);
136: keyList.add(key);
137: valueList.add(value);
138: }
139: keyCollection = new CollectionAndSequence(
140: new SimpleSequence(keyList));
141: valueCollection = new CollectionAndSequence(
142: new SimpleSequence(valueList));
143: }
144:
145: public int size() {
146: return size;
147: }
148:
149: public TemplateCollectionModel keys() {
150: return keyCollection;
151: }
152:
153: public TemplateCollectionModel values() {
154: return valueCollection;
155: }
156:
157: public TemplateModel get(String key) {
158: return (TemplateModel) keyMap.get(key);
159: }
160:
161: public boolean isEmpty() {
162: return size == 0;
163: }
164: }
165: }
|