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Diffstat (limited to 'velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/PropertyExecutor.java')
-rw-r--r-- | velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/PropertyExecutor.java | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/PropertyExecutor.java b/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/PropertyExecutor.java new file mode 100644 index 00000000..7763724c --- /dev/null +++ b/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/PropertyExecutor.java @@ -0,0 +1,151 @@ +package org.apache.velocity.runtime.parser.node; + +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +import org.apache.commons.lang3.StringUtils; +import org.apache.velocity.exception.VelocityException; +import org.apache.velocity.util.ArrayListWrapper; +import org.apache.velocity.util.introspection.Introspector; +import org.slf4j.Logger; + +import java.lang.reflect.InvocationTargetException; + +/** + * Returned the value of object property when executed. + */ +public class PropertyExecutor extends AbstractExecutor +{ + private final Introspector introspector; + private final boolean wrapArray; + + /** + * @param log + * @param introspector + * @param clazz + * @param property + * @since 1.5 + */ + public PropertyExecutor(final Logger log, final Introspector introspector, + final Class<?> clazz, final String property) + { + this(log, introspector, clazz, property, false); + } + + /** + * @param log + * @param introspector + * @param clazz + * @param property + * @param wrapArray + * @since 1.5 + */ + public PropertyExecutor(final Logger log, final Introspector introspector, + final Class<?> clazz, final String property, final boolean wrapArray) + { + this.log = log; + this.introspector = introspector; + this.wrapArray = wrapArray; + + // Don't allow passing in the empty string or null because + // it will either fail with a StringIndexOutOfBounds error + // or the introspector will get confused. + if (StringUtils.isNotEmpty(property)) + { + discover(clazz, property); + } + } + + /** + * @return The current introspector. + * @since 1.5 + */ + protected Introspector getIntrospector() + { + return this.introspector; + } + + /** + * @param clazz + * @param property + */ + protected void discover(final Class<?> clazz, final String property) + { + /* + * this is gross and linear, but it keeps it straightforward. + */ + + try + { + Object [] params = {}; + + StringBuilder sb = new StringBuilder("get"); + sb.append(property); + + setMethod(introspector.getMethod(clazz, sb.toString(), params)); + + if (!isAlive()) + { + /* + * now the convenience, flip the 1st character + */ + + char c = sb.charAt(3); + + if (Character.isLowerCase(c)) + { + sb.setCharAt(3, Character.toUpperCase(c)); + } + else + { + sb.setCharAt(3, Character.toLowerCase(c)); + } + + setMethod(introspector.getMethod(clazz, sb.toString(), params)); + } + } + /* + * pass through application level runtime exceptions + */ + catch( RuntimeException e ) + { + throw e; + } + catch(Exception e) + { + String msg = "Exception while looking for property getter for '" + property; + log.error(msg, e); + throw new VelocityException(msg, e); + } + } + + /** + * @see org.apache.velocity.runtime.parser.node.AbstractExecutor#execute(java.lang.Object) + */ + @Override + public Object execute(Object o) + throws IllegalAccessException, InvocationTargetException + { + if (wrapArray) + { + o = new ArrayListWrapper(o); + } + return isAlive() ? getMethod().invoke(o, ((Object []) null)) : null; + } +} |