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The basic runtime tools and interfaces for intarsys components.
/*
* Copyright (c) 2007, intarsys consulting GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of intarsys nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package de.intarsys.tools.functor;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import de.intarsys.tools.collection.ArrayIterator;
/**
* A concrete generic implementation for {@link IArgs}.
*
*/
public class Args implements IArgs {
static class Binding implements IBinding {
protected String name;
protected Object value;
protected Binding(String name) {
super();
this.name = name;
this.value = UNDEFINED;
}
protected Binding(String name, Object value) {
super();
this.name = name;
this.value = value;
}
@Override
public String getName() {
return name;
}
@Override
public Object getValue() {
return value == UNDEFINED ? null : value;
}
@Override
public boolean isDefined() {
return value != UNDEFINED;
}
@Override
public void setValue(Object pValue) {
value = pValue;
}
@Override
public String toString() {
return "" + name + ":" + value;
}
}
static final private Binding[] EMPTY = new Binding[0];
private static final Object UNDEFINED = new Object();
public static Args create() {
return new Args();
}
public static Args createIndexed(Object p1) {
List list = new ArrayList();
list.add(p1);
return new Args(list);
}
public static Args createIndexed(Object p1, Object p2) {
List list = new ArrayList();
list.add(p1);
list.add(p2);
return new Args(list);
}
public static Args createIndexed(Object p1, Object p2, Object p3) {
List list = new ArrayList();
list.add(p1);
list.add(p2);
list.add(p3);
return new Args(list);
}
public static Args createNamed(String key, Object value) {
Map map = new HashMap();
map.put(key, value);
return new Args(map);
}
public static Args createNamed(String key1, Object value1, String key2,
Object value2) {
Map map = new HashMap();
map.put(key1, value1);
map.put(key2, value2);
return new Args(map);
}
private Binding[] entries = EMPTY;
private int ptr = 0;
public Args() {
super();
}
public Args(Args pArgs) {
super();
if (pArgs == null) {
return;
}
ptr = pArgs.ptr;
if (ptr > 0) {
entries = new Binding[ptr];
for (int i = 0; i < ptr; i++) {
Binding tempEntry = pArgs.entries[i];
Object value = tempEntry.value;
if (value instanceof IArgs) {
entries[i] = new Binding(tempEntry.name,
((IArgs) value).copy());
} else {
entries[i] = new Binding(tempEntry.name, value);
}
}
}
}
public Args(List values) {
super();
ptr = values.size();
entries = new Binding[ptr];
for (int i = 0; i < ptr; i++) {
entries[i] = new Binding(null, values.get(i));
}
}
public Args(Map values) {
super();
ptr = values.size();
entries = new Binding[ptr];
int i = 0;
for (Iterator it = values.entrySet().iterator(); it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
String name = (String) entry.getKey();
Object value = entry.getValue();
entries[i++] = new Binding(name, value);
}
}
public Args(Object[] values) {
super();
if (values != null) {
// its common for values to be null, for example in java reflection
// code -> support it
ptr = values.length;
entries = new Binding[ptr];
for (int i = 0; i < ptr; i++) {
entries[i] = new Binding(null, values[i]);
}
}
}
public IBinding add(Object object) {
ensureCapacity(ptr);
Binding tempBinding = new Binding(null, object);
entries[ptr++] = tempBinding;
return tempBinding;
}
@Override
public Iterator bindings() {
return new ArrayIterator(entries, ptr);
}
public void clear() {
for (int i = 0; i < ptr; i++) {
entries[i] = null;
}
ptr = 0;
}
@Override
public IArgs copy() {
return new Args(this);
}
@Override
public IBinding declare(String name) {
Binding tempBinding;
// first check all bindings if already available
for (int i = 0; i < ptr; i++) {
tempBinding = entries[i];
if (name.equals(tempBinding.name)) {
return tempBinding;
}
}
// try to bind get the unnamed binding
for (int i = 0; i < ptr; i++) {
tempBinding = entries[i];
if (tempBinding.name == null) {
tempBinding.name = name;
return tempBinding;
}
}
// add new entry
ensureCapacity(ptr);
tempBinding = new Binding(name);
entries[ptr++] = tempBinding;
return tempBinding;
}
protected void ensureCapacity(int min) {
if (min >= entries.length) {
Binding[] newEntries = new Binding[min + 4];
System.arraycopy(entries, 0, newEntries, 0, entries.length);
entries = newEntries;
}
}
public Object get(int index) {
if (index < 0 || (index >= ptr)) {
return null;
}
if (entries[index].isDefined()) {
return entries[index].value;
} else {
return null;
}
}
public Object get(int index, Object defaultValue) {
if (index < 0 || (index >= ptr)) {
return defaultValue;
}
if (entries[index].isDefined()) {
return entries[index].value;
} else {
return defaultValue;
}
}
public Object get(String name) {
for (int i = 0; i < ptr; i++) {
Binding entry = entries[i];
if (name.equals(entry.name) && entry.isDefined()) {
return entry.value;
}
}
return null;
}
public Object get(String name, Object defaultValue) {
for (int i = 0; i < ptr; i++) {
Binding entry = entries[i];
if (name.equals(entry.name) && entry.isDefined()) {
return entry.value;
}
}
return defaultValue;
}
public boolean isDefined(String name) {
for (int i = 0; i < ptr; i++) {
Binding entry = entries[i];
if (name.equals(entry.name)) {
return entry.isDefined();
}
}
return false;
}
public boolean isIndexed() {
return true;
}
public boolean isNamed() {
for (int i = 0; i < ptr; i++) {
Binding entry = entries[i];
if (entry.name != null) {
return true;
}
}
return false;
}
public Set names() {
Set result = new HashSet();
for (int i = 0; i < ptr; i++) {
Binding entry = entries[i];
if (entry.name != null) {
result.add(entry.name);
}
}
return result;
}
public IBinding put(int index, Object value) {
Binding tempBinding;
if (index >= ptr) {
ensureCapacity(index);
for (int i = ptr; i < index; i++) {
entries[i] = new Binding(null);
}
tempBinding = new Binding(null, value);
entries[index] = tempBinding;
ptr = index + 1;
} else {
tempBinding = entries[index];
entries[index].setValue(value);
}
return tempBinding;
}
public IBinding put(String name, Object value) {
Binding tempBinding;
for (int i = 0; i < ptr; i++) {
Binding entry = entries[i];
if (name.equals(entry.name)) {
tempBinding = entry;
entry.setValue(value);
return tempBinding;
}
}
ensureCapacity(ptr);
tempBinding = new Binding(name, value);
entries[ptr++] = tempBinding;
return tempBinding;
}
public int size() {
return ptr;
}
@Override
public String toString() {
return ArgTools.toString(this, "");
}
public void undefine(int index) {
if (index < ptr) {
entries[index].setValue(UNDEFINED);
}
}
public void undefine(String name) {
Binding tempBinding;
for (int i = 0; i < ptr; i++) {
Binding entry = entries[i];
if (name.equals(entry.name)) {
tempBinding = entry;
entry.setValue(UNDEFINED);
}
}
}
}
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